6 Center for Astrophysics and Space Sciences, University of California at San Diego, ... Cyg X-1 was in its spectrally hard state and the observation was performed ... With emission lines of He-like Mg xi, we detect two plasma components with ...

The nebula is nearly 50 light-years in diameter, and may owe much of its illumination to Deneb. To locate it, first find Deneb and the reddish Xi Cygni (3.7). With x 7 or x 8.5 the Nebula is then in the same field. With x 12 the field will barely cover ...

Learn the history of Cygnus Constellation and other fun facts such as the brightest star in Cygnus. Latin for "Swan" Cygnus the bird-shaped constellation, is also known by other names such as "bird" or "hen". Learn other little-known and interesting facts on the stars, deep sky objects and mythology associated with the constellation.

Trieste, Italy (1899) XI Settimana della Cultura Dal 18 al 26 aprile 2009 tutti i musei statali sono aperti gratuitamente. Sono inoltre in programma anche diverse manifestazioni culturali. From 18th to 26th of April 2009 all state museums in Italy will be open free of charge (ask the information points in the town you are visiting for more details).